constructor()

in src/lambda.ts [48:95]

• 43 lines of code
• 2 McCabe index (conditional complexity)

  constructor(scope: Construct, id: string, props: WatchLambdaFunctionProps) {
    super(scope, id);

    const cfnFunction = props.fn.node.defaultChild as lambda.CfnFunction;
    const timeoutSec = cfnFunction.timeout || 3;

    this.watchful = props.watchful;
    this.fn = props.fn;
    this.metrics = new LambdaMetricFactory();

    this.watchful.addSection(props.title, {
      links: [
        { title: 'AWS Lambda Console', url: linkForLambdaFunction(this.fn) },
        { title: 'CloudWatch Logs', url: linkForLambdaLogs(this.fn) },
      ],
    });

    const { errorsMetric, errorsAlarm } = this.createErrorsMonitor(props.errorsPerMinuteThreshold);
    const { throttlesMetric, throttlesAlarm } = this.createThrottlesMonitor(props.throttlesPerMinuteThreshold);
    const { durationMetric, durationAlarm } = this.createDurationMonitor(timeoutSec, props.durationThresholdPercent);
    const invocationsMetric = this.metrics.metricInvocations(this.fn.functionName);

    this.watchful.addWidgets(
      new cloudwatch.GraphWidget({
        title: `Invocations/${invocationsMetric.period.toMinutes()}min`,
        width: 6,
        left: [invocationsMetric],
      }),
      new cloudwatch.GraphWidget({
        title: `Errors/${errorsMetric.period.toMinutes()}min`,
        width: 6,
        left: [errorsMetric],
        leftAnnotations: [errorsAlarm.toAnnotation()],
      }),
      new cloudwatch.GraphWidget({
        title: `Throttles/${throttlesMetric.period.toMinutes()}min`,
        width: 6,
        left: [throttlesMetric],
        leftAnnotations: [throttlesAlarm.toAnnotation()],
      }),
      new cloudwatch.GraphWidget({
        title: `Duration/${durationMetric.period.toMinutes()}min`,
        width: 6,
        left: [durationMetric],
        leftAnnotations: [durationAlarm.toAnnotation()],
      }),
    );
  }